Within the literature significant variations in martensite start temperature (M_s) can be observed for samples of identical composition. However, the factors affecting M_s are not well understood, limiting industrial uptake. Recently, claims that the isothermal variant of the ω phase (ω_iso) may be driving many changes in M_s have been called into question due to the absence of any compositionally distinct ω_isofollowing thermal cycling. In the present study, in situ synchrotron X-ray diffraction has been employed to conclusively show that dramatic changes in M_s can be replicated without any formation of ω_iso. Dislocations have been shown to be mobile at the temperatures reached and, as such, an alternative mechanism based on the total stress model has been proposed. This added understanding can rationalise many of the discrepancies observed in the literature, and ultimately improve industrial uptake of this class of material.

在文献中，对于相同成分的样品，可以观察到马氏体起始温度 (Ms) 的显_着变化。然而，影响M _{s 的}因素尚不清楚，限制了工业应用。最近，由于热循环后不存在任何成分不同的 ω iso ，有关 ω 相 (ω _{iso )}的等温变体可能驱动M _s发生许多变化的说法受到了质疑。在本研究中，原位同步加速器 X 射线衍射已被用来最终表明M _s的巨大变化可以在不形成任何 ω 的情况下复制。_.iso。位错已被证明在达到的温度下是可移动的，因此，已经提出了基于总应力模型的替代机制。这种额外的理解可以合理化文献中观察到的许多差异，并最终提高此类材料的工业应用。